It's Katie's 17th birthday – the dancefloor is packed, the drink is flowing and Rave-fess, the Raven's Hill School confession site, is alight with gossip.

Then a huge fight breaks out, sending guests fleeing.

When Frankie, Jess and Sorcha go back to help Katie clear up the wrecked house before her parents get home, they find more than broken bottles …

There's a body on the living room floor.